PPRuNe Forums - View Single Post - Air Asia Indonesia Lost Contact from Surabaya to Singapore
Old 3rd Jan 2015, 11:58
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mary meagher
 
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Thank you, Dave Reid, for that very useful link to the full UK AAIB report on the Boeing 737 stall - a full stall, NOT just the approach to the stall - that took place on approach to Bournemouth on a flight from Faro on 23 Sept. 2007.

As nobody got hurt and it was early in the day at a quiet airport, the details of the incident got lost in the bureaucracy, and only a sharp eyed chap in the back office flagged up the true significance. By that time the airliner and the pilots involved had been flying as usual, for several weeks, without sharing the experience with the authorities....which means the Black Boxes had gone on to other things. However the pilot did talk to the company engineer, who assured him the data had been saved on the OFDM, or operational flight detail mentoring, which was sent to the company by mobile phone. And THAT's how the scary charts and details were saved and then studied by the AAIB.

Quite simply, they didn't monitor the airspeed. The auto throttle had disconnected and the warning light wasn't noticed.

And as Jimjim has posted here, if you intuitively apply FULL power, underslung engines can tip up the aircraft so that the elevator is not so effective. A balance has to be achieved, by using trim, power, AND elevator to recover from a full stall. Airline pilots reading this, please have a good look at that AAIB full report referred to by DaveReid. It was not an Airbus, it was an elderly Boeing. and it was not an Asian Airline, nor overly deferential Asian pilots, they were both British, well trained and fully experienced.

They probably overlooked the inconspicuous warning light on the Boeing panel that the autothrottle had disconnected. With everything hanging down, the engines, the flaps, the spoilers, here goes the STALL STALL STALL noise, and what do you do 800 feet from the runway at a speed of 82 knots? Well, it pitched up 33 degrees, they did very well to go around.

All in a day's work. But what is different about having everything go pearshaped in a Cunimb at 38,000 feet? Should have plenty of time to sort things out, and those who fly in these latitudes are experienced in interesting conditions.
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